Problema ao instalar plugin

Quando eu tento instalar o plugin kpof, aparece esse erro. O que está havendo?

Exception in thread "main" java.lang.IllegalStateException: Could not load plugi
n descriptor for existing plugin [kopf]. Was the plugin built before 2.0?
Likely root cause: java.nio.file.NoSuchFileException: D:\Estudo\elasticsearch-2.
3.1\elasticsearch-2.3.1\plugins\kopf\plugin-descriptor.properties
        at sun.nio.fs.WindowsException.translateToIOException(WindowsException.j
ava:79)
        at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.jav
a:97)
        at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.jav
a:102)
        at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystem
Provider.java:230)
        at java.nio.file.Files.newByteChannel(Files.java:361)
        at java.nio.file.Files.newByteChannel(Files.java:407)
        at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvide
r.java:384)
        at java.nio.file.Files.newInputStream(Files.java:152)
        at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.ja
va:87)
        at org.elasticsearch.plugins.PluginsService.getPluginBundles(PluginsServ
ice.java:378)
        at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:1
28)
        at org.elasticsearch.node.Node.<init>(Node.java:158)
        at org.elasticsearch.node.Node.<init>(Node.java:140)
        at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:143)
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:178)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:270)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)